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C. POTTER, JB., OF WESTEBLY, RHODE ISLAND.

Letters Pat/:nt No. 73,195, dated January-7, 1868.

IMPROVEMENT IN PRINTING-PRESSES.

TO ALL WHOM IT MAY CONCERN:

Beit known that I, C. POTTER, Jr., of Westerly, in the county ofWashington, and State of Rhode Island, have invented a new and usefulImprovement in Drum-Cylinder Printing-Presses; and that the followingdescription, taken in connection with the accompanying drawingshereinafter referred to, forms a full'and exact specification of thesame, .wherein I have set forth the nature and principles of my saidimproveme'nt, by which my invention may be distinguished from all othersof a similar class, together with such parts as I claim, and desire tohave'seeured to me by Letters Patent'.

This invention consists in hanging or arranging the cylinder of thatkind of printing-presses known as the drumfcylinder, in such a. mannerthat the cylinder may be raised at any time or at the will of theoperator, so as to -be inoperative or incapable of giving anyimpression.

The object of the invention is to give the operator or attendant entirecontrol over the pressure-cylinder, so that in case of a sheet of paperbeing improperly set or presented to the cylinder,` or. the failure'of asheet being presented to it at all, the pressure-cylinder, by beingraised, will obviate many diiculties attending the above-mentionedcontingencies. In the accompanying sheet of drawings- Figure 1represents a. side sectional view of a press provided with my invention,taken in the line x ir, iig. 2.

Figure 2, a front view of the same. i

Similar letters of reference indicate like parts. y v

A represents the frame of a drum-cylinder printing-press, and B thereciprocatingr form-bed thereof. These parts may be of usualconstruction, and therefore do not require a special description. Crepresents the drumcylinder, which is constructed as usual, but hung ina novel way1 as follows: The shaftD of this cylinder-passes-eccentrically through its bearings E E, as shown clearly in ig. 1, andthese bearings are fitted in boxes F,

which are placed between guides a a, at each side of the frame A, andare adjusted at a greater or less height by 'means of set-screws Iz. Thebearings E E are allowed to turn freely in the boxes F, and each bearinghas a toothed segment or partially-toothed pinion, G, keyed upon it,(see iig. 2,) and these segments or pinions gear into segment-racks H H,which are at the upper ends of radius arms I I, connected at their lowerendsto a shaft, J, in the lower part of the frame A. 'On one end of theshaft D of the drum-cylinder, there is keyed a wheel or pulley, K,having a bar, c, attached to its inner side, and to one side ofthe frameA there is attached a bent lever, L, which, when its outer end ispressed down, bears against the radius armfIin the rear of it, andthrows the rack- H at the upper end of said arm backward, therebyturning both pinions G, as both radius arms I are operated inconsequence of being connected by the shaft J, and both bearings E willbe turned, and the drum-cylinder C raised so as to be free from the formon hed B, owing to its shaft D passing eccentrically through saidbearings. The drum-cylinders only remain elevated during one revolutionof the d1'un1cylinder C, as the bar c on the inner side of the wheel orpulleys K, comes in contact with a` pin, al, projecting from the segmentH, which is by the side of the wheel or pulley K, and throws said4segment back to its original position, so that the drum-cylinder isautomatically lowered to a working position in time to receive a sheetand press it upon the form on bed B.

In printing, the advantages derived by having the press so constructedthat the impression may be thrown of at thewill of the operator withoutstopping the press are many and important, and among them may beenumerated the following:`

If the feeder or operator fails to get the sheet properly to the guides,the sheet, if taken at all by the nippers, is printed out of registerand is spoiled, and both the paper and presswork are lost. This occursoften, and is the source of great loss in printing.

Again, if the nippers fail to takethe sheet atall, then the impressionis taken upon the blanket, the tympan-1 sheet, or the overlays, in whichcase, the next two or three sheets are spoiled by the offsetting oftheink from the blanket, or tympan-sheet, or overlays g' but what is ofmuch more serious consequence many times, is, thatv the overlays, whichsometimes take days in getting ready for a single form, are, after a fewfalse impressions,- so injured as to require to be made over again.

Again, in very tine work', much rolling of the form is required, and forsuch work the presses have to be made with additional rollers, as theforms pass under the inkingrollers and back but once to each impression,

"lds 2 thereby rendering necessary very great additional cost in theirconstruction, while they are still liable to the' same objectionsenumerated in the two preceding paragraphs; while, if the impressioncould be prevented being taken, at the will of the operator, he couldroll or ink his form as many times as he liked before taking the'impression. i I

So important, in fact, are these points in presses, that most of thebook-work, and by far the largest share of the ne cut-work, are done onthe bed and platen" press lrnown as the Adams patent press, having thefacilities for throwing olf the impressions, and the advantages therebyderived as enumerated above, while in the presses known as cylinderprinting-presses, wiz, those having a reciprocating form or type-bed,and a con tinuous rotary movement of the cylinder, giving an impressionto each revolution of the cylinder, it, though exceedingly desirable,has never been accomplished, though the latter class 'of presses are, atthe present day, probably more numerous than any other in use.

I have, in my improvements now made, accomplished. successfully thedesired result, and the important parts of it are shown in the drawingsaccompanying this application. And in order to enable others to make anduse said invention, the following description isvgiven ofthesaidimprovement I vIn the model, the shcet-nippers were not made, buttheir position indicated only, and the time of taking the sheet isimmediately after the nipper-edge of impression-surface, as indicated,passes out from under the feed-table, when the cylinder is revolvedl inthe direction of the arrow, and the time for impression to commence iswhen the nipper-edgc, thus indicated, comes into a position next the bedH, vertically, under vthe shaft of the cylinder. l l

Having thus described my invention, I claim as new, and desire to secureby Letters Patent, in printingpresses known as cylinderprinting-presses, having a reciprocating form-bed for holding andcarrying the type, and a cylinder having a continuous rotary movement,and making one revolution to each impression, working in combinationwith the bed impression- Il.V The combination of the eccentric bearingE, adj ustablc box F, segmental pinions G, segments H, lever L, andcylinder C, substantially as described for the purpose specified.

v 2. The wheel K and cam c, in combination with the eccentric bearing E,for the purpose of returning the cylinder after having been lifted toits original position before taking a sheet, substantially as hereinshown and described.

C. POTTER, JR.

Witnesses:

WM. F. McNAMAnA, ALEX. F. ROBERTS.

